中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

10 records (took 0.021 seconds)

    Adjusting method and adjusting system for power amplifier
    1.
    发明授权
    Adjusting method and adjusting system for power amplifier 有权

    公开(公告)号：US11482971B2

    公开(公告)日：2022-10-25

    申请号：US16976484

    申请日：2019-02-25

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Yoshinori Suzuki ,  Kohei Suzaki ,  Fumihiro Yamashita

    IPC: H03F1/26 ,  H03F1/32 ,  H03F3/24

    Abstract: An object is to provide a method and a system of adjusting a power amplifier which makes it possible to adjust a linearizer using signals of two carriers by the same power, to reduce the influence of the non-linearity on a multicarrier signal compared with the conventional. A method of adjusting a power amplifier, the power amplifier including a linearizer to reduce an intermodulation caused by non-linearity of the power amplifier, includes: inputting two signals generated by a signal generator into the power amplifier; measuring power of each order of first intermodulations of the two signals output from the power amplifier; calculating a power sum of second intermodulations by the plurality of signals using the measured power of each order of the first intermodulations; and adjusting the linearizer so that the power sum of the second intermodulations by the plurality of signals takes a minimum value or at most a predetermined value.

    COMMUNICATION SYSTEM AND COMMUNICATION METHOD
    2.
    发明申请
    COMMUNICATION SYSTEM AND COMMUNICATION METHOD 有权

    公开(公告)号：US20210328658A1

    公开(公告)日：2021-10-21

    申请号：US17260610

    申请日：2019-06-27

    Applicant: Nippon Telegraph and Telephone Corporation

    Inventor： Kohei Suzaki ,  Yusuke Asai ,  Hiroyuki Shiba

    IPC: H04B7/185 ,  H04W16/26 ,  H04W16/28 ,  H04W88/04

    Abstract: A communication system including a mobile station that communicates with a wireless station and moves toward a predetermined destination, and a relay station that relays communication between the mobile station and the wireless station, includes: the mobile station that pauses movement when sensing an obstacle present on a first moving route toward the destination in a case of moving along the first moving route, and moves along a second moving route headed to the destination while avoiding the obstacle when establishing communication between the mobile station and the wireless station via the relay station in a case where the movement is paused; and the relay station that moves so as to keep a position where communication between the mobile station and the wireless station can be relayed according to movement of the mobile station when the mobile station moves along the second moving route.

    Communication system and communication method
    3.
    发明授权
    Communication system and communication method 有权

    公开(公告)号：US11757525B2

    公开(公告)日：2023-09-12

    申请号：US17260610

    申请日：2019-06-27

    Applicant: Nippon Telegraph and Telephone Corporation

    Inventor： Kohei Suzaki ,  Yusuke Asai ,  Hiroyuki Shiba

    IPC: H04B7/185 ,  H04W16/26 ,  H04W16/28 ,  H04W88/04

    CPC classification number: H04B7/18508 ,  H04W16/26 ,  H04W16/28 ,  H04W88/04

    Abstract: A communication system including a mobile station that communicates with a wireless station and moves toward a predetermined destination, and a relay station that relays communication between the mobile station and the wireless station, includes: the mobile station that pauses movement when sensing an obstacle present on a first moving route toward the destination in a case of moving along the first moving route, and moves along a second moving route headed to the destination while avoiding the obstacle when establishing communication between the mobile station and the wireless station via the relay station in a case where the movement is paused; and the relay station that moves so as to keep a position where communication between the mobile station and the wireless station can be relayed according to movement of the mobile station when the mobile station moves along the second moving route.

    Interference source searching method and interference source searching apparatus
    6.
    发明授权
    Interference source searching method and interference source searching apparatus 有权

    公开(公告)号：US11733344B2

    公开(公告)日：2023-08-22

    申请号：US16973408

    申请日：2019-05-21

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Kohei Suzaki ,  Ryo Miyatake ,  Yusuke Asai ,  Hiroyuki Shiba

    IPC: G01S5/02 ,  H04B17/27 ,  H04B17/345 ,  G06T7/246 ,  G01S5/00

    CPC classification number: G01S5/0278 ,  G01S5/02 ,  G01S5/0215 ,  G06T7/246 ,  H04B17/27 ,  H04B17/345 ,  G01S5/011 ,  G06T2207/30192

    Abstract: An interference source hunting method of hunting for an interference source of electromagnetic waves while moving between multiple measurement points, includes the steps of acquiring strength information of electromagnetic waves, estimating a distance from the measurement point to the location of the interference source, based on the strength information, calculating a first presence probability that the interference source is present at each position, based on whether a distance from the measurement point to the position is within the distance, updating second presence probabilities acquired in hunting in the past, based on the first presence probabilities, determining a position obtained by moving, by a predetermined distance, the measurement point toward a position with the second presence probability higher than the second presence probability at the measurement point, as a new measurement point, and determining, in a case where a size of an area in which each of the second presence probabilities is greater than or equal to a predetermined value is less than a predetermined value, that the location of the interference source is within the area.

    Radio environment estimation method and radio environment estimation apparatus
    8.
    发明授权
    Radio environment estimation method and radio environment estimation apparatus 有权

    公开(公告)号：US11277214B2

    公开(公告)日：2022-03-15

    申请号：US16968839

    申请日：2019-02-13

    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    Inventor： Ryo Miyatake ,  Hiroyuki Shiba ,  Yusuke Asai ,  Kohei Suzaki

    IPC: H04B17/391 ,  H04B17/309 ,  H04W16/18 ,  G01S5/02

    Abstract: A synthetic reception strength value in a case of synthesizing indirect waves of radio waves generated due to an obstruction is calculated for each piece of receive antenna coordinate information in consideration of a phase of each indirect wave. Relation information indicating relation between input information and teaching information is generated. The input information is the synthetic reception strength value for each piece of the receive antenna coordinate information corresponding to transmit antenna coordinate information. The teaching information is information indicating a reception state of the radio waves being calculated using a method of actually measuring the radio waves output by the transmit antenna at a position of a receive antenna or a method other than the method of the actual measurement. Strength of the radio waves is estimated by calculating the information indicating the reception state of the radio waves by using the transmit antenna coordinate information for evaluation and the generated relation information.

Patent Agency Ranking